JETech® Apple Certified USB Sync and Charging Cable for iPhone 4 / 4S, iPhone 3G / 3GS, iPad 1/2/3, iPod tower 1 meter (1m White Tower Cable-30pin) (Wireless Phone Accessory)
The cable is used only to charge and discharge would cost more than what it cost. Do not allow synchronization (iPhone, iPad ...) flashes and nothing happens. I do not recommend this.